I am so stoked to find this project alive after all these years!
I am also a metadata-obsessed nerd. I am digging the page types concept, but finding it impossible at scale.
I can't set the type of multiple pages at once (shift-select, etc.), and while I can use the keyboard, I also basically just flipped through the entire book setting 98% of the pages to Story...
Could there be a setting to just go ahead and mark all the pages after the first, as Story by default? Then I only need to check for pages to delete, or previews, editorials/roundups? (Until I give up and stop caring about those, probably).
Dream state would also be some spoiler mode, that blurs the Story pages by default, so you don't get some dramatic reveal spoiled in the last frame, just checking if there is an ad/tag at the end of the book.